21004410023 has 8 divisors (see below), whose sum is σ = 21496330800. Its totient is φ = 20518176448.

The previous prime is 21004410013. The next prime is 21004410041. The reversal of 21004410023 is 32001440012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004410023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21004409983 and 21004410010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004410013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1414328 + ... + 1429101.

It is an arithmetic number, because the mean of its divisors is an integer number (2687041350).

Almost surely, 2^21004410023 is an apocalyptic number.

21004410023 is a deficient number, since it is larger than the sum of its proper divisors (491920777).

21004410023 is an equidigital number, since it uses as much as digits as its factorization.

21004410023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2843601.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21004410023 its reverse (32001440012), we get a palindrome (53005850035).

The spelling of 21004410023 in words is "twenty-one billion, four million, four hundred ten thousand, twenty-three".